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I have used my iPad Air 2 cord to charge my iPhone 5s a handful of times, in a pinch. I have not had any problems with it. I've had the phone a little over a year now. I've also used my iPhone plug to charge the iPad, it just takes longer due to lower frequency.

I can't really speak to the long term effects this may have on the battery. If you're concerned about that, I suggest you contact Apple support, or stop by the Genius Bar at a local Apple store.